Apparatus for improving the linearity of TV transmitters using a klystron
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United States of America Patent
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-
Dec 1, 1987
Grant Date -
N/A
app pub date -
Feb 5, 1985
filing date -
Feb 6, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A broadcast signal transmitter utilizes a klystron and a transmitter amplifier (10) operating in a pulsed mode. Two feedback loops are provided for controlling the output of the amplifier (10). A first feedback loop includes a control circuit (14) for providing automatic gain control of the black level of a vision signal to be transmitted while the second feedback loop includes a further control circuit (18) for improving the linearity of the transmitter. The first feedback loop output control signal at line rate while the second feedback loop output signals at first rate, both being operative during the period when an insertion test signal (I.T.S.) is supplied to the transmitter.
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